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Diffstat (limited to 'arch/ppc/boot/simple/rw4/rw4_init_brd.S')
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diff --git a/arch/ppc/boot/simple/rw4/rw4_init_brd.S b/arch/ppc/boot/simple/rw4/rw4_init_brd.S
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--- a/arch/ppc/boot/simple/rw4/rw4_init_brd.S
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-/*----------------------------------------------------------------------------+
-| This source code has been made available to you by IBM on an AS-IS
-| basis. Anyone receiving this source is licensed under IBM
-| copyrights to use it in any way he or she deems fit, including
-| copying it, modifying it, compiling it, and redistributing it either
-| with or without modifications. No license under IBM patents or
-| patent applications is to be implied by the copyright license.
-|
-| Any user of this software should understand that IBM cannot provide
-| technical support for this software and will not be responsible for
-| any consequences resulting from the use of this software.
-|
-| Any person who transfers this source code or any derivative work
-| must include the IBM copyright notice, this paragraph, and the
-| preceding two paragraphs in the transferred software.
-|
-| COPYRIGHT I B M CORPORATION 1997
-| LICENSED MATERIAL - PROGRAM PROPERTY OF I B M
-+----------------------------------------------------------------------------*/
-/*----------------------------------------------------------------------------+
-| Author: Tony J. Cerreto
-| Component: BSPS
-| File: init_brd.s
-| Purpose: Vesta Evaluation Board initialization subroutines. The following
-| routines are available:
-| 1. INITB_EBIU0: Initialize EBIU0.
-| 2. INITB_CONFIG: Configure board.
-| 3. INITB_HSMC0: Initialize HSMC0 (SDRAM).
-| 4. INITB_HSMC1: Initialize HSMC1 (SDRAM).
-| 5. INITB_CACHE: Initialize Data and Instruction Cache.
-| 6. INITB_DCACHE: Initialize Data Cache.
-| 7. INITB_ICACHE: Initialize Instruction Cache.
-| 8. INITB_GET_CSPD: Get CPU Speed (Bus Speed and Processor Speed)
-|
-| Changes:
-| Date: Author Comment:
-| --------- ------ --------
-| 01-Mar-00 tjc Created
-| 04-Mar-00 jfh Modified CIC_SEL3_VAL to support 1284 (Mux3 & GPIO 21-28)
-| 04-Mar-00 jfh Modified XILINIX Reg 0 to support 1284 (Mux3 & GPIO 21-28)
-| 04-Mar-00 jfh Modified XILINIX Reg 1 to support 1284 (Mux3 & GPIO 21-28)
-| 04-Mar-00 jfh Modified XILINIX Reg 4 to support 1284 (Mux3 & GPIO 21-28)
-| 19-May-00 rlb Relcoated HSMC0 to 0x1F000000 to support 32MB of contiguous
-| SDRAM space. Changed cache ctl regs to reflect this.
-| 22-May-00 tjc Changed initb_get_cspd interface and eliminated
-| initb_get_bspd routines.
-| 26-May-00 tjc Added two nop instructions after all mtxxx/mfxxx
-| instructions due to PPC405 bug.
-+----------------------------------------------------------------------------*/
-#define VESTA
-#include "ppc_40x.h"
-#include "stb.h"
-
-/*----------------------------------------------------------------------------+
-| BOARD CONFIGURATION DEFINES
-+----------------------------------------------------------------------------*/
-#define CBS0_CR_VAL 0x00000002 /* CBS control reg value */
-#define CIC0_CR_VAL 0xD0800448 /* CIC control reg value */
-#define CIC0_SEL3_VAL 0x11500000 /* CIC select 3 reg value */
-#define CIC0_VCR_VAL 0x00631700 /* CIC video cntl reg value */
-
-/*----------------------------------------------------------------------------+
-| EBIU0 BANK REGISTERS DEFINES
-+----------------------------------------------------------------------------*/
-#define EBIU0_BRCRH0_VAL 0x00000000 /* BR High 0 (Extension Reg)*/
-#define EBIU0_BRCRH1_VAL 0x00000000 /* BR High 1 (Extension Reg)*/
-#define EBIU0_BRCRH2_VAL 0x40000000 /* BR High 2 (Extension Reg)*/
-#define EBIU0_BRCRH3_VAL 0x40000000 /* BR High 3 (Extension Reg)*/
-#define EBIU0_BRCRH4_VAL 0x00000000 /* BR High 4 (Extension Reg)*/
-#define EBIU0_BRCRH5_VAL 0x00000000 /* BR High 5 (Extension Reg)*/
-#define EBIU0_BRCRH6_VAL 0x00000000 /* BR High 6 (Extension Reg)*/
-#define EBIU0_BRCRH7_VAL 0x40000000 /* BR High 7 (Extension Reg)*/
-
-#define EBIU0_BRCR0_VAL 0xFC58BFFE /* BR 0: 16 bit Flash 4 MB */
-#define EBIU0_BRCR1_VAL 0xFF00BFFE /* BR 1: Ext Connector 1 MB */
-#if 1
-#define EBIU0_BRCR2_VAL 0x207CFFBE /* BR 2: Xilinx 8 MB */
- /* twt == 0x3f */
-#else
-#define EBIU0_BRCR2_VAL 0x207CCFBE /* BR 2: Xilinx 8 MB */
- /* twt == 0x0f */
-#endif
-#define EBIU0_BRCR3_VAL 0x407CBFBE /* BR 3: IDE Drive 8 MB */
-#define EBIU0_BRCR4_VAL 0xFF00BFFF /* BR 4: Disabled. 0 MB */
-#define EBIU0_BRCR5_VAL 0xFF00BFFF /* BR 5: Disabled. 0 MB */
-#define EBIU0_BRCR6_VAL 0xFF00BFFF /* BR 6: Disabled. 0 MB */
-#define EBIU0_BRCR7_VAL 0xCE3F0003 /* BR 7: Line Mode DMA 2 MB */
-
-/*----------------------------------------------------------------------------+
-| GPIO DEFINES
-+----------------------------------------------------------------------------*/
-#define STB_GPIO0_OUTPUT (STB_GPIO0_BASE_ADDRESS+ 0x00)
-#define STB_GPIO0_TC (STB_GPIO0_BASE_ADDRESS+ 0x04)
-#define STB_GPIO0_OS_0_31 (STB_GPIO0_BASE_ADDRESS+ 0x08)
-#define STB_GPIO0_OS_32_63 (STB_GPIO0_BASE_ADDRESS+ 0x0C)
-#define STB_GPIO0_TS_0_31 (STB_GPIO0_BASE_ADDRESS+ 0x10)
-#define STB_GPIO0_TS_32_63 (STB_GPIO0_BASE_ADDRESS+ 0x14)
-#define STB_GPIO0_OD (STB_GPIO0_BASE_ADDRESS+ 0x18)
-#define STB_GPIO0_INPUT (STB_GPIO0_BASE_ADDRESS+ 0x1C)
-#define STB_GPIO0_R1 (STB_GPIO0_BASE_ADDRESS+ 0x20)
-#define STB_GPIO0_R2 (STB_GPIO0_BASE_ADDRESS+ 0x24)
-#define STB_GPIO0_R3 (STB_GPIO0_BASE_ADDRESS+ 0x28)
-#define STB_GPIO0_IS_1_0_31 (STB_GPIO0_BASE_ADDRESS+ 0x30)
-#define STB_GPIO0_IS_1_32_63 (STB_GPIO0_BASE_ADDRESS+ 0x34)
-#define STB_GPIO0_IS_2_0_31 (STB_GPIO0_BASE_ADDRESS+ 0x38)
-#define STB_GPIO0_IS_2_32_63 (STB_GPIO0_BASE_ADDRESS+ 0x3C)
-#define STB_GPIO0_IS_3_0_31 (STB_GPIO0_BASE_ADDRESS+ 0x40)
-#define STB_GPIO0_IS_3_32_63 (STB_GPIO0_BASE_ADDRESS+ 0x44)
-#define STB_GPIO0_SS_1 (STB_GPIO0_BASE_ADDRESS+ 0x50)
-#define STB_GPIO0_SS_2 (STB_GPIO0_BASE_ADDRESS+ 0x54)
-#define STB_GPIO0_SS_3 (STB_GPIO0_BASE_ADDRESS+ 0x58)
-
-#define GPIO0_TC_VAL 0x0C020004 /* three-state control val */
-#define GPIO0_OS_0_31_VAL 0x51A00004 /* output select 0-31 val */
-#define GPIO0_OS_32_63_VAL 0x0000002F /* output select 32-63 val */
-#define GPIO0_TS_0_31_VAL 0x51A00000 /* three-state sel 0-31 val*/
-#define GPIO0_TS_32_63_VAL 0x0000000F /* three-state sel 32-63 val*/
-#define GPIO0_OD_VAL 0xC0000004 /* open drain val */
-#define GPIO0_IS_1_0_31_VAL 0x50000151 /* input select 1 0-31 val */
-#define GPIO0_IS_1_32_63_VAL 0x00000000 /* input select 1 32-63 val */
-#define GPIO0_IS_2_0_31_VAL 0x00000000 /* input select 2 0-31 val */
-#define GPIO0_IS_2_32_63_VAL 0x00000000 /* input select 2 32-63 val */
-#define GPIO0_IS_3_0_31_VAL 0x00000440 /* input select 3 0-31 val */
-#define GPIO0_IS_3_32_63_VAL 0x00000000 /* input select 3 32-63 val */
-#define GPIO0_SS_1_VAL 0x00000000 /* sync select 1 val */
-#define GPIO0_SS_2_VAL 0x00000000 /* sync select 2 val */
-#define GPIO0_SS_3_VAL 0x00000000 /* sync select 3 val */
-
-/*----------------------------------------------------------------------------+
-| XILINX DEFINES
-+----------------------------------------------------------------------------*/
-#define STB_XILINX_LED (STB_FPGA_BASE_ADDRESS+ 0x0100)
-#define STB_XILINX1_REG0 (STB_FPGA_BASE_ADDRESS+ 0x40000)
-#define STB_XILINX1_REG1 (STB_FPGA_BASE_ADDRESS+ 0x40002)
-#define STB_XILINX1_REG2 (STB_FPGA_BASE_ADDRESS+ 0x40004)
-#define STB_XILINX1_REG3 (STB_FPGA_BASE_ADDRESS+ 0x40006)
-#define STB_XILINX1_REG4 (STB_FPGA_BASE_ADDRESS+ 0x40008)
-#define STB_XILINX1_REG5 (STB_FPGA_BASE_ADDRESS+ 0x4000A)
-#define STB_XILINX1_REG6 (STB_FPGA_BASE_ADDRESS+ 0x4000C)
-#define STB_XILINX1_ID (STB_FPGA_BASE_ADDRESS+ 0x4000E)
-#define STB_XILINX1_FLUSH (STB_FPGA_BASE_ADDRESS+ 0x4000E)
-#define STB_XILINX2_REG0 (STB_FPGA_BASE_ADDRESS+ 0x80000)
-#define STB_XILINX2_REG1 (STB_FPGA_BASE_ADDRESS+ 0x80002)
-#define STB_XILINX2_REG2 (STB_FPGA_BASE_ADDRESS+ 0x80004)
-
-#define XILINX1_R0_VAL 0x2440 /* Xilinx 1 Register 0 Val */
-#define XILINX1_R1_VAL 0x0025 /* Xilinx 1 Register 1 Val */
-#define XILINX1_R2_VAL 0x0441 /* Xilinx 1 Register 2 Val */
-#define XILINX1_R3_VAL 0x0008 /* Xilinx 1 Register 3 Val */
-#define XILINX1_R4_VAL 0x0100 /* Xilinx 1 Register 4 Val */
-#define XILINX1_R5_VAL 0x6810 /* Xilinx 1 Register 5 Val */
-#define XILINX1_R6_VAL 0x0000 /* Xilinx 1 Register 6 Val */
-#if 0
-#define XILINX2_R0_VAL 0x0008 /* Xilinx 2 Register 0 Val */
-#define XILINX2_R1_VAL 0x0000 /* Xilinx 2 Register 1 Val */
-#else
-#define XILINX2_R0_VAL 0x0018 /* disable IBM IrDA RxD */
-#define XILINX2_R1_VAL 0x0008 /* enable SICC MAX chip */
-#endif
-#define XILINX2_R2_VAL 0x0000 /* Xilinx 2 Register 2 Val */
-
-/*----------------------------------------------------------------------------+
-| HSMC BANK REGISTERS DEFINES
-+----------------------------------------------------------------------------*/
-#ifdef SDRAM16MB
-#define HSMC0_BR0_VAL 0x000D2D55 /* 0x1F000000-007FFFFF R/W */
-#define HSMC0_BR1_VAL 0x008D2D55 /* 0x1F800000-1FFFFFFF R/W */
-#else
-#define HSMC0_BR0_VAL 0x1F0D2D55 /* 0x1F000000-007FFFFF R/W */
-#define HSMC0_BR1_VAL 0x1F8D2D55 /* 0x1F800000-1FFFFFFF R/W */
-#endif
-#define HSMC1_BR0_VAL 0xA00D2D55 /* 0xA0000000-A07FFFFF R/W */
-#define HSMC1_BR1_VAL 0xA08D2D55 /* 0xA0800000-A0FFFFFF R/W */
-
-/*----------------------------------------------------------------------------+
-| CACHE DEFINES
-+----------------------------------------------------------------------------*/
-#define DCACHE_NLINES 128 /* no. D-cache lines */
-#define DCACHE_NBYTES 32 /* no. bytes/ D-cache line */
-#define ICACHE_NLINES 256 /* no. I-cache lines */
-#define ICACHE_NBYTES 32 /* no. bytes/ I-cache line */
-#ifdef SDRAM16MB
-#define DCACHE_ENABLE 0x80000000 /* D-cache regions to enable*/
-#define ICACHE_ENABLE 0x80000001 /* I-cache regions to enable*/
-#else
-#define DCACHE_ENABLE 0x18000000 /* D-cache regions to enable*/
-#define ICACHE_ENABLE 0x18000001 /* I-cache regions to enable*/
-#endif
-
-/*----------------------------------------------------------------------------+
-| CPU CORE SPEED CALCULATION DEFINES
-+----------------------------------------------------------------------------*/
-#define GCS_LCNT 500000 /* CPU speed loop count */
-#define GCS_TROW_BYTES 8 /* no. bytes in table row */
-#define GCS_CTICK_TOL 100 /* allowable clock tick tol */
-#define GCS_NMULT 4 /* no. of core speed mults */
-
- /*--------------------------------------------------------------------+
- | No. 13.5Mhz
- | Clock Ticks
- | based on a
- | loop count Bus
- | of 100,000 Speed
- +--------------------------------------------------------------------*/
-gcs_lookup_table:
- .int 50000, 54000000 /* 54.0 Mhz */
- .int 66667, 40500000 /* 40.5 Mhz */
- .int 54545, 49500000 /* 49.5 Mhz */
- .int 46154, 58500000 /* 58.5 Mhz */
- .int 0, 0 /* end of table flag */
-
-
-/*****************************************************************************+
-| XXXXXXX XXX XXX XXXXXX XXXXXXX XXXXXX XX XX XX XXXX
-| XX X XX XX X XX X XX X XX XX XXX XX XXXX XX
-| XX X XXX XX XX X XX XX XXXX XX XX XX XX
-| XXXX X XX XXXX XXXXX XX XXXX XX XX XX
-| XX X XXX XX XX X XX XX XX XXX XXXXXX XX
-| XX X XX XX XX XX X XX XX XX XX XX XX XX XX
-| XXXXXXX XXX XXX XXXX XXXXXXX XXX XX XX XX XX XX XXXXXXX
-+*****************************************************************************/
-/******************************************************************************
-|
-| Routine: INITB_EBIU0.
-|
-| Purpose: Initialize all the EBIU0 Bank Registers
-| Parameters: None.
-| Returns: None.
-|
-******************************************************************************/
- function_prolog(initb_ebiu0)
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 0
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR0_VAL@h
- ori r10,r10,EBIU0_BRCR0_VAL@l
- mtdcr ebiu0_brcr0,r10
- lis r10,EBIU0_BRCRH0_VAL@h
- ori r10,r10,EBIU0_BRCRH0_VAL@l
- mtdcr ebiu0_brcrh0,r10
-
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 1
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR1_VAL@h
- ori r10,r10,EBIU0_BRCR1_VAL@l
- mtdcr ebiu0_brcr1,r10
- lis r10,EBIU0_BRCRH1_VAL@h
- ori r10,r10,EBIU0_BRCRH1_VAL@l
- mtdcr ebiu0_brcrh1,r10
-
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 2
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR2_VAL@h
- ori r10,r10,EBIU0_BRCR2_VAL@l
- mtdcr ebiu0_brcr2,r10
- lis r10,EBIU0_BRCRH2_VAL@h
- ori r10,r10,EBIU0_BRCRH2_VAL@l
- mtdcr ebiu0_brcrh2,r10
-
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 3
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR3_VAL@h
- ori r10,r10,EBIU0_BRCR3_VAL@l
- mtdcr ebiu0_brcr3,r10
- lis r10,EBIU0_BRCRH3_VAL@h
- ori r10,r10,EBIU0_BRCRH3_VAL@l
- mtdcr ebiu0_brcrh3,r10
-
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 4
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR4_VAL@h
- ori r10,r10,EBIU0_BRCR4_VAL@l
- mtdcr ebiu0_brcr4,r10
- lis r10,EBIU0_BRCRH4_VAL@h
- ori r10,r10,EBIU0_BRCRH4_VAL@l
- mtdcr ebiu0_brcrh4,r10
-
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 5
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR5_VAL@h
- ori r10,r10,EBIU0_BRCR5_VAL@l
- mtdcr ebiu0_brcr5,r10
- lis r10,EBIU0_BRCRH5_VAL@h
- ori r10,r10,EBIU0_BRCRH5_VAL@l
- mtdcr ebiu0_brcrh5,r10
-
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 6
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR6_VAL@h
- ori r10,r10,EBIU0_BRCR6_VAL@l
- mtdcr ebiu0_brcr6,r10
- lis r10,EBIU0_BRCRH6_VAL@h
- ori r10,r10,EBIU0_BRCRH6_VAL@l
- mtdcr ebiu0_brcrh6,r10
-
- /*--------------------------------------------------------------------+
- | Set EBIU0 Bank 7
- +--------------------------------------------------------------------*/
- lis r10,EBIU0_BRCR7_VAL@h
- ori r10,r10,EBIU0_BRCR7_VAL@l
- mtdcr ebiu0_brcr7,r10
- lis r10,EBIU0_BRCRH7_VAL@h
- ori r10,r10,EBIU0_BRCRH7_VAL@l
- mtdcr ebiu0_brcrh7,r10
-
- blr
- function_epilog(initb_ebiu0)
-
-
-/******************************************************************************
-|
-| Routine: INITB_CONFIG
-|
-| Purpose: Configure the Vesta Evaluation Board. The following items
-| will be configured:
-| 1. Cross-Bar Switch.
-| 2. Chip Interconnect.
-| 3. Clear/reset key PPC registers.
-| 4. Xilinx and GPIO Registers.
-|
-| Returns: None.
-|
-******************************************************************************/
- function_prolog(initb_config)
- /*--------------------------------------------------------------------+
- | Init CROSS-BAR SWITCH
- +--------------------------------------------------------------------*/
- lis r10,CBS0_CR_VAL@h /* r10 <- CBS Cntl Reg val */
- ori r10,r10,CBS0_CR_VAL@l
- mtdcr cbs0_cr,r10
-
- /*--------------------------------------------------------------------+
- | Init Chip-Interconnect (CIC) Registers
- +--------------------------------------------------------------------*/
- lis r10,CIC0_CR_VAL@h /* r10 <- CIC Cntl Reg val */
- ori r10,r10,CIC0_CR_VAL@l
- mtdcr cic0_cr,r10
-
- lis r10,CIC0_SEL3_VAL@h /* r10 <- CIC SEL3 Reg val */
- ori r10,r10,CIC0_SEL3_VAL@l
- mtdcr cic0_sel3,r10
-
- lis r10,CIC0_VCR_VAL@h /* r10 <- CIC Vid C-Reg val */
- ori r10,r10,CIC0_VCR_VAL@l
- mtdcr cic0_vcr,r10
-
- /*--------------------------------------------------------------------+
- | Clear SGR and DCWR
- +--------------------------------------------------------------------*/
- li r10,0x0000
- mtspr sgr,r10
- mtspr dcwr,r10
-
- /*--------------------------------------------------------------------+
- | Clear/set up some machine state registers.
- +--------------------------------------------------------------------*/
- li r10,0x0000 /* r10 <- 0 */
- mtdcr ebiu0_besr,r10 /* clr Bus Err Syndrome Reg */
- mtspr esr,r10 /* clr Exceptn Syndrome Reg */
- mttcr r10 /* timer control register */
-
- mtdcr uic0_er,r10 /* disable all interrupts */
-
- /* UIC_IIC0 | UIC_IIC1 | UIC_U0 | UIC_IR_RCV | UIC_IR_XMIT */
- lis r10, 0x00600e00@h
- ori r10,r10,0x00600e00@l
- mtdcr uic0_pr,r10
-
- li r10,0x00000020 /* UIC_EIR1 */
- mtdcr uic0_tr,r10
-
- lis r10,0xFFFF /* r10 <- 0xFFFFFFFF */
- ori r10,r10,0xFFFF /* */
- mtdbsr r10 /* clear/reset the dbsr */
- mtdcr uic0_sr,r10 /* clear pending interrupts */
-
- li r10,0x1000 /* set Machine Exception bit*/
- oris r10,r10,0x2 /* set Criticl Exception bit*/
- mtmsr r10 /* change MSR */
-
- /*--------------------------------------------------------------------+
- | Clear XER.
- +--------------------------------------------------------------------*/
- li r10,0x0000
- mtxer r10
-
- /*--------------------------------------------------------------------+
- | Init GPIO0 Registers
- +--------------------------------------------------------------------*/
- lis r10, STB_GPIO0_TC@h /* Three-state control */
- ori r10,r10,STB_GPIO0_TC@l
- lis r11, GPIO0_TC_VAL@h
- ori r11,r11,GPIO0_TC_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_OS_0_31@h /* output select 0-31 */
- ori r10,r10,STB_GPIO0_OS_0_31@l
- lis r11, GPIO0_OS_0_31_VAL@h
- ori r11,r11,GPIO0_OS_0_31_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_OS_32_63@h /* output select 32-63 */
- ori r10,r10,STB_GPIO0_OS_32_63@l
- lis r11, GPIO0_OS_32_63_VAL@h
- ori r11,r11,GPIO0_OS_32_63_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_TS_0_31@h /* three-state select 0-31 */
- ori r10,r10,STB_GPIO0_TS_0_31@l
- lis r11, GPIO0_TS_0_31_VAL@h
- ori r11,r11,GPIO0_TS_0_31_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_TS_32_63@h /* three-state select 32-63 */
- ori r10,r10,STB_GPIO0_TS_32_63@l
- lis r11, GPIO0_TS_32_63_VAL@h
- ori r11,r11,GPIO0_TS_32_63_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_OD@h /* open drain */
- ori r10,r10,STB_GPIO0_OD@l
- lis r11, GPIO0_OD_VAL@h
- ori r11,r11,GPIO0_OD_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_IS_1_0_31@h /* input select 1, 0-31 */
- ori r10,r10,STB_GPIO0_IS_1_0_31@l
- lis r11, GPIO0_IS_1_0_31_VAL@h
- ori r11,r11,GPIO0_IS_1_0_31_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_IS_1_32_63@h /* input select 1, 32-63 */
- ori r10,r10,STB_GPIO0_IS_1_32_63@l
- lis r11, GPIO0_IS_1_32_63_VAL@h
- ori r11,r11,GPIO0_IS_1_32_63_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_IS_2_0_31@h /* input select 2, 0-31 */
- ori r10,r10,STB_GPIO0_IS_2_0_31@l
- lis r11, GPIO0_IS_2_0_31_VAL@h
- ori r11,r11,GPIO0_IS_2_0_31_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_IS_2_32_63@h /* input select 2, 32-63 */
- ori r10,r10,STB_GPIO0_IS_2_32_63@l
- lis r11, GPIO0_IS_2_32_63_VAL@h
- ori r11,r11,GPIO0_IS_2_32_63_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_IS_3_0_31@h /* input select 3, 0-31 */
- ori r10,r10,STB_GPIO0_IS_3_0_31@l
- lis r11, GPIO0_IS_3_0_31_VAL@h
- ori r11,r11,GPIO0_IS_3_0_31_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_IS_3_32_63@h /* input select 3, 32-63 */
- ori r10,r10,STB_GPIO0_IS_3_32_63@l
- lis r11, GPIO0_IS_3_32_63_VAL@h
- ori r11,r11,GPIO0_IS_3_32_63_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_SS_1@h /* sync select 1 */
- ori r10,r10,STB_GPIO0_SS_1@l
- lis r11, GPIO0_SS_1_VAL@h
- ori r11,r11,GPIO0_SS_1_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_SS_2@h /* sync select 2 */
- ori r10,r10,STB_GPIO0_SS_2@l
- lis r11, GPIO0_SS_2_VAL@h
- ori r11,r11,GPIO0_SS_2_VAL@l
- stw r11,0(r10)
-
- lis r10, STB_GPIO0_SS_3@h /* sync select 3 */
- ori r10,r10,STB_GPIO0_SS_3@l
- lis r11, GPIO0_SS_3_VAL@h
- ori r11,r11,GPIO0_SS_3_VAL@l
- stw r11,0(r10)
-
- /*--------------------------------------------------------------------+
- | Init Xilinx #1 Registers
- +--------------------------------------------------------------------*/
- lis r10, STB_XILINX1_REG0@h /* init Xilinx1 Reg 0 */
- ori r10,r10,STB_XILINX1_REG0@l
- li r11,XILINX1_R0_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX1_REG1@h /* init Xilinx1 Reg 1 */
- ori r10,r10,STB_XILINX1_REG1@l
- li r11,XILINX1_R1_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX1_REG2@h /* init Xilinx1 Reg 2 */
- ori r10,r10,STB_XILINX1_REG2@l
- li r11,XILINX1_R2_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX1_REG3@h /* init Xilinx1 Reg 3 */
- ori r10,r10,STB_XILINX1_REG3@l
- li r11,XILINX1_R3_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX1_REG4@h /* init Xilinx1 Reg 4 */
- ori r10,r10,STB_XILINX1_REG4@l
- li r11,XILINX1_R4_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX1_REG5@h /* init Xilinx1 Reg 5 */
- ori r10,r10,STB_XILINX1_REG5@l
- li r11,XILINX1_R5_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX1_REG6@h /* init Xilinx1 Reg 6 */
- ori r10,r10,STB_XILINX1_REG6@l
- li r11,XILINX1_R6_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX1_FLUSH@h /* latch registers in Xilinx*/
- ori r10,r10,STB_XILINX1_FLUSH@l
- li r11,0x0000
- sth r11,0(r10)
-
- /*--------------------------------------------------------------------+
- | Init Xilinx #2 Registers
- +--------------------------------------------------------------------*/
- lis r10, STB_XILINX2_REG0@h /* init Xilinx2 Reg 0 */
- ori r10,r10,STB_XILINX2_REG0@l
- li r11,XILINX2_R0_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX2_REG1@h /* init Xilinx2 Reg 1 */
- ori r10,r10,STB_XILINX2_REG1@l
- li r11,XILINX2_R1_VAL
- sth r11,0(r10)
-
- lis r10, STB_XILINX2_REG2@h /* init Xilinx2 Reg 2 */
- ori r10,r10,STB_XILINX2_REG2@l
- li r11,XILINX2_R2_VAL
- sth r11,0(r10)
-
- blr
- function_epilog(initb_config)
-
-
-/******************************************************************************
-|
-| Routine: INITB_HSMC0.
-|
-| Purpose: Initialize the HSMC0 Registers for SDRAM
-| Parameters: None.
-| Returns: R3 = 0: Successful
-| = -1: Unsuccessful, SDRAM did not reset properly.
-|
-******************************************************************************/
- function_prolog(initb_hsmc0)
- mflr r0 /* Save return addr */
-
- /*--------------------------------------------------------------------+
- | Set Global SDRAM Controller to recommended default
- +--------------------------------------------------------------------*/
- lis r10,0x6C00
- ori r10,r10,0x0000
- mtdcr hsmc0_gr,r10
-
- /*--------------------------------------------------------------------+
- | Set HSMC0 Data Register to recommended default
- +--------------------------------------------------------------------*/
- lis r10,0x0037
- ori r10,r10,0x0000
- mtdcr hsmc0_data,r10
-
- /*--------------------------------------------------------------------+
- | Init HSMC0 Bank Register 0
- +--------------------------------------------------------------------*/
- lis r10,HSMC0_BR0_VAL@h
- ori r10,r10,HSMC0_BR0_VAL@l
- mtdcr hsmc0_br0,r10
-
- /*--------------------------------------------------------------------+
- | Init HSMC0 Bank Register 1
- +--------------------------------------------------------------------*/
- lis r10,HSMC0_BR1_VAL@h
- ori r10,r10,HSMC0_BR1_VAL@l
- mtdcr hsmc0_br1,r10
-
- /*--------------------------------------------------------------------+
- | Set HSMC0 Control Reg 0
- +--------------------------------------------------------------------*/
- lis r10,0x8077 /* PRECHARGE ALL DEVICE BKS */
- ori r10,r10,0x0000
- mtdcr hsmc0_cr0,r10
- li r3,0x0000
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne cr0,hsmc0_err
-
- lis r10,0x8078 /* AUTO-REFRESH */
- ori r10,r10,0x0000
- mtdcr hsmc0_cr0,r10
- li r3,0x0000
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne cr0,hsmc0_err
-
- lis r10,0x8070 /* PROG MODE W/DATA REG VAL */
- ori r10,r10,0x8000
- mtdcr hsmc0_cr0,r10
- li r3,0x0000
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne hsmc0_err
-
- /*--------------------------------------------------------------------+
- | Set HSMC0 Control Reg 1
- +--------------------------------------------------------------------*/
- lis r10,0x8077 /* PRECHARGE ALL DEVICE BKS */
- ori r10,r10,0x0000
- mtdcr hsmc0_cr1,r10
- li r3,0x0001
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne cr0,hsmc0_err
-
- lis r10,0x8078 /* AUTO-REFRESH */
- ori r10,r10,0x0000
- mtdcr hsmc0_cr1,r10
- li r3,0x0001
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne cr0,hsmc0_err
-
- lis r10,0x8070 /* PROG MODE W/DATA REG VAL */
- ori r10,r10,0x8000
- mtdcr hsmc0_cr1,r10
- li r3,0x0001
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne cr0,hsmc0_err
-
- /*--------------------------------------------------------------------+
- | Set HSMC0 Refresh Register
- +--------------------------------------------------------------------*/
- lis r10,0x0FE1
- ori r10,r10,0x0000
- mtdcr hsmc0_crr,r10
- li r3,0
-
-hsmc0_err:
- mtlr r0
- blr
- function_epilog(initb_hsmc0)
-
-
-/******************************************************************************
-|
-| Routine: INITB_HSMC1.
-|
-| Purpose: Initialize the HSMC1 Registers for SDRAM
-| Parameters: None.
-| Returns: R3 = 0: Successful
-| = -1: Unsuccessful, SDRAM did not reset properly.
-|
-******************************************************************************/
- function_prolog(initb_hsmc1)
- mflr r0 /* Save return addr */
-
- /*--------------------------------------------------------------------+
- | Set Global SDRAM Controller to recommended default
- +--------------------------------------------------------------------*/
- lis r10,0x6C00
- ori r10,r10,0x0000
- mtdcr hsmc1_gr,r10
-
- /*--------------------------------------------------------------------+
- | Set HSMC1 Data Register to recommended default
- +--------------------------------------------------------------------*/
- lis r10,0x0037
- ori r10,r10,0x0000
- mtdcr hsmc1_data,r10
-
- /*--------------------------------------------------------------------+
- | Init HSMC1 Bank Register 0
- +--------------------------------------------------------------------*/
- lis r10,HSMC1_BR0_VAL@h
- ori r10,r10,HSMC1_BR0_VAL@l
- mtdcr hsmc1_br0,r10
-
- /*--------------------------------------------------------------------+
- | Init HSMC1 Bank Register 1
- +--------------------------------------------------------------------*/
- lis r10,HSMC1_BR1_VAL@h
- ori r10,r10,HSMC1_BR1_VAL@l
- mtdcr hsmc1_br1,r10
-
- /*--------------------------------------------------------------------+
- | Set HSMC1 Control Reg 0
- +--------------------------------------------------------------------*/
- lis r10,0x8077 /* PRECHARGE ALL DEVICE BANKS */
- ori r10,r10,0x0000
- mtdcr hsmc1_cr0,r10
- li r3,0x0002
- bl hsmc_cr_wait /* wait for operation completion */
- cmpwi cr0,r3,0x0000
- bne hsmc1_err
-
- lis r10,0x8078 /* AUTO-REFRESH */
- ori r10,r10,0x0000
- mtdcr hsmc1_cr0,r10
- li r3,0x0002
- bl hsmc_cr_wait /* wait for operation completion */
- cmpwi cr0,r3,0x0000
- bne hsmc1_err
-
- lis r10,0x8070 /* PROGRAM MODE W/DATA REG VALUE */
- ori r10,r10,0x8000
- mtdcr hsmc1_cr0,r10
- li r3,0x0002
- bl hsmc_cr_wait /* wait for operation completion */
- cmpwi cr0,r3,0x0000
- bne hsmc1_err
-
- /*--------------------------------------------------------------------+
- | Set HSMC1 Control Reg 1
- +--------------------------------------------------------------------*/
- lis r10,0x8077 /* PRECHARGE ALL DEVICE BKS */
- ori r10,r10,0x0000
- mtdcr hsmc1_cr1,r10
- li r3,0x0003
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne hsmc1_err
-
- lis r10,0x8078 /* AUTO-REFRESH */
- ori r10,r10,0x0000
- mtdcr hsmc1_cr1,r10
- li r3,0x0003
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne hsmc1_err
-
- lis r10,0x8070 /* PROG MODE W/DATA REG VAL */
- ori r10,r10,0x8000
- mtdcr hsmc1_cr1,r10
- li r3,0x0003
- bl hsmc_cr_wait /* wait for op completion */
- cmpwi cr0,r3,0x0000
- bne hsmc1_err
-
- /*--------------------------------------------------------------------+
- | Set HSMC1 Refresh Register
- +--------------------------------------------------------------------*/
- lis r10,0x0FE1
- ori r10,r10,0x0000
- mtdcr hsmc1_crr,r10
- xor r3,r3,r3
-
-hsmc1_err:
- mtlr r0
- blr
- function_epilog(initb_hsmc1)
-
-
-/******************************************************************************
-|
-| Routine: INITB_CACHE
-|
-| Purpose: This routine will enable Data and Instruction Cache.
-| The Data Cache is an 8K two-way set associative and the
-| Instruction Cache is an 16K two-way set associative cache.
-|
-| Parameters: None.
-|
-| Returns: None.
-|
-******************************************************************************/
- function_prolog(initb_cache)
- mflr r0 /* Save return addr */
-
- bl initb_Dcache /* enable D-Cache */
- bl initb_Icache /* enable I-Cache */
-
- mtlr r0
- blr
- function_epilog(initb_cache)
-
-
-/******************************************************************************
-|
-| Routine: INITB_DCACHE
-|
-| Purpose: This routine will invalidate all data in the Data Cache and
-| then enable D-Cache. If cache is enabled already, the D-Cache
-| will be flushed before the data is invalidated.
-|
-| Parameters: None.
-|
-| Returns: None.
-|
-******************************************************************************/
- function_prolog(initb_Dcache)
- /*--------------------------------------------------------------------+
- | Flush Data Cache if enabled
- +--------------------------------------------------------------------*/
- mfdccr r10 /* r10 <- DCCR */
- isync /* ensure prev insts done */
- cmpwi r10,0x00
- beq ic_dcinv /* D-cache off, invalidate */
-
- /*--------------------------------------------------------------------+
- | Data Cache enabled, force known memory addresses to be Cached
- +--------------------------------------------------------------------*/
- lis r10,HSMC0_BR0_VAL@h /* r10 <- first memory loc */
- andis. r10,r10,0xFFF0
- li r11,DCACHE_NLINES /* r11 <- # A-way addresses */
- addi r11,r11,DCACHE_NLINES /* r11 <- # B-way addresses */
- mtctr r11 /* set loop counter */
-
-ic_dcload:
- lwz r12,0(r10) /* force cache of address */
- addi r10,r10,DCACHE_NBYTES /* r10 <- next memory loc */
- bdnz ic_dcload
- sync /* ensure prev insts done */
- isync
-
- /*--------------------------------------------------------------------+
- | Flush the known memory addresses from Cache
- +--------------------------------------------------------------------*/
- lis r10,HSMC0_BR0_VAL@h /* r10 <- first memory loc */
- andis. r10,r10,0xFFF0
- mtctr r11 /* set loop counter */
-
-ic_dcflush:
- dcbf 0,r10 /* flush D-cache line */
- addi r10,r10,DCACHE_NBYTES /* r10 <- next memory loc */
- bdnz ic_dcflush
- sync /* ensure prev insts done */
- isync
-
- /*--------------------------------------------------------------------+
- | Disable then invalidate Data Cache
- +--------------------------------------------------------------------*/
- li r10,0 /* r10 <- 0 */
- mtdccr r10 /* disable the D-Cache */
- isync /* ensure prev insts done */
-
-ic_dcinv:
- li r10,0 /* r10 <- line address */
- li r11,DCACHE_NLINES /* r11 <- # lines in cache */
- mtctr r11 /* set loop counter */
-
-ic_dcloop:
- dccci 0,r10 /* invalidate A/B cache lns */
- addi r10,r10,DCACHE_NBYTES /* bump to next line */
- bdnz ic_dcloop
- sync /* ensure prev insts done */
- isync
-
- /*--------------------------------------------------------------------+
- | Enable Data Cache
- +--------------------------------------------------------------------*/
- lis r10,DCACHE_ENABLE@h /* r10 <- D-cache enable msk*/
- ori r10,r10,DCACHE_ENABLE@l
- mtdccr r10
- sync /* ensure prev insts done */
- isync
-
- blr
- function_epilog(initb_Dcache)
-
-
-/******************************************************************************
-|
-| Routine: INITB_ICACHE
-|
-| Purpose: This routine will invalidate all data in the Instruction
-| Cache then enable I-Cache.
-|
-| Parameters: None.
-|
-| Returns: None.
-|
-******************************************************************************/
- function_prolog(initb_Icache)
- /*--------------------------------------------------------------------+
- | Invalidate Instruction Cache
- +--------------------------------------------------------------------*/
- li r10,0 /* r10 <- lines address */
- iccci 0,r10 /* invalidate all I-cache */
- sync /* ensure prev insts done */
- isync
-
- /*--------------------------------------------------------------------+
- | Enable Instruction Cache
- +--------------------------------------------------------------------*/
- lis r10,ICACHE_ENABLE@h /* r10 <- I-cache enable msk*/
- ori r10,r10,ICACHE_ENABLE@l
- mticcr r10
- sync /* ensure prev insts done */
- isync
-
- blr
- function_epilog(initb_Icache)
-
-#if 0
-/******************************************************************************
-|
-| Routine: INITB_GET_CSPD
-|
-| Purpose: Determine the CPU Core Speed. The 13.5 Mhz Time Base
-| Counter (TBC) is used to measure a conditional branch
-| instruction.
-|
-| Parameters: R3 = Address of Bus Speed
-| R4 = Address of Core Speed
-|
-| Returns: (R3) = >0: Bus Speed.
-| 0: Bus Speed not found in Look-Up Table.
-| (R4) = >0: Core Speed.
-| 0: Core Speed not found in Look-Up Table.
-|
-| Note: 1. This routine assumes the bdnz branch instruction takes
-| two instruction cycles to complete.
-| 2. This routine must be called before interrupts are enabled.
-|
-******************************************************************************/
- function_prolog(initb_get_cspd)
- mflr r0 /* Save return address */
- /*--------------------------------------------------------------------+
- | Set-up timed loop
- +--------------------------------------------------------------------*/
- lis r9,gcs_time_loop@h /* r9 <- addr loop instr */
- ori r9,r9,gcs_time_loop@l
- lis r10,GCS_LCNT@h /* r10 <- loop count */
- ori r10,r10,GCS_LCNT@l
- mtctr r10 /* ctr <- loop count */
- lis r11,STB_TIMERS_TBC@h /* r11 <- TBC register addr */
- ori r11,r11,STB_TIMERS_TBC@l
- li r12,0 /* r12 <- 0 */
-
- /*--------------------------------------------------------------------+
- | Cache timed-loop instruction
- +--------------------------------------------------------------------*/
- icbt 0,r9
- sync
- isync
-
- /*--------------------------------------------------------------------+
- | Get number of 13.5 Mhz cycles to execute time-loop
- +--------------------------------------------------------------------*/
- stw r12,0(r11) /* reset TBC */
-gcs_time_loop:
- bdnz+ gcs_time_loop /* force branch pred taken */
- lwz r5,0(r11) /* r5 <- num 13.5 Mhz ticks */
- li r6,5 /* LUT based on 1/5th the...*/
- divw r5,r5,r6 /*..loop count used */
- sync
- isync
-
- /*--------------------------------------------------------------------+
- | Look-up core speed based on TBC value
- +--------------------------------------------------------------------*/
- lis r6,gcs_lookup_table@h /* r6 <- pts at core spd LUT*/
- ori r6,r6,gcs_lookup_table@l
- bl gcs_cspd_lookup /* find core speed in LUT */
-
- mtlr r0 /* set return address */
- blr
- function_epilog(initb_get_cspd)
-
-#endif
-/*****************************************************************************+
-| XXXX XX XX XXXXXX XXXXXXX XXXXXX XX XX XX XXXX
-| XX XXX XX X XX X XX X XX XX XXX XX XXXX XX
-| XX XXXX XX XX XX X XX XX XXXX XX XX XX XX
-| XX XX XXXX XX XXXX XXXXX XX XXXX XX XX XX
-| XX XX XXX XX XX X XX XX XX XXX XXXXXX XX
-| XX XX XX XX XX X XX XX XX XX XX XX XX XX
-| XXXX XX XX XXXX XXXXXXX XXX XX XX XX XX XX XXXXXXX
-+*****************************************************************************/
-/******************************************************************************
-|
-| Routine: HSMC_CR_WAIT
-|
-| Purpose: Wait for the HSMC Control Register (bits 12-16) to be reset
-| after an auto-refresh, pre-charge or program mode register
-| command execution.
-|
-| Parameters: R3 = HSMC Control Register ID.
-| 0: HSMC0 CR0
-| 1: HSMC0 CR1
-| 2: HSMC1 CR0
-| 3: HSMC1 CR1
-|
-| Returns: R3 = 0: Successful
-| -1: Unsuccessful
-|
-******************************************************************************/
-hsmc_cr_wait:
-
- li r11,10 /* r11 <- retry counter */
- mtctr r11 /* set retry counter */
- mr r11,r3 /* r11 <- HSMC CR reg id */
-
-hsmc_cr_rep:
- bdz hsmc_cr_err /* branch if max retries hit*/
-
- /*--------------------------------------------------------------------+
- | GET HSMCx_CRx value based on HSMC Control Register ID
- +--------------------------------------------------------------------*/
-try_hsmc0_cr0: /* CHECK IF ID=HSMC0 CR0 REG*/
- cmpwi cr0,r11,0x0000
- bne cr0,try_hsmc0_cr1
- mfdcr r10,hsmc0_cr0 /* r11 <- HSMC0 CR0 value */
- b hsmc_cr_read
-
-try_hsmc0_cr1: /* CHECK IF ID=HSMC0 CR1 REG*/
- cmpwi cr0,r11,0x0001
- bne cr0,try_hsmc1_cr0
- mfdcr r10,hsmc0_cr1 /* r10 <- HSMC0 CR1 value */
- b hsmc_cr_read
-
-try_hsmc1_cr0: /* CHECK IF ID=HSMC1 CR0 REG*/
- cmpwi cr0,r11,0x0002
- bne cr0,try_hsmc1_cr1
- mfdcr r10,hsmc1_cr0 /* r10 <- HSMC1 CR0 value */
- b hsmc_cr_read
-
-try_hsmc1_cr1: /* CHECK IF ID=HSMC1 CR1 REG*/
- cmpwi cr0,r11,0x0003
- bne cr0,hsmc_cr_err
- mfdcr r10,hsmc1_cr1 /* r10 <- HSMC1 CR1 value */
-
- /*--------------------------------------------------------------------+
- | Check if HSMC CR register was reset after command execution
- +--------------------------------------------------------------------*/
-hsmc_cr_read:
- lis r12,0x000F /* create "AND" mask */
- ori r12,r12,0x8000
- and. r10,r10,r12 /* r10 <- HSMC CR bits 12-16*/
- bne cr0,hsmc_cr_rep /* wait for bits to reset */
- li r3,0 /* set return code = success*/
- b hsmc_cr_done
-
-hsmc_cr_err: /* ERROR: SDRAM didn't reset*/
- li r3,-1 /* set RC=unsuccessful */
-
-hsmc_cr_done:
- blr
-
-#if 0
-/******************************************************************************
-|
-| Routine: GCS_CSPD_LOOKUP
-|
-| Purpose: Uses the number of 13.5 Mhz clock ticks found after executing
-| the branch instruction time loop to look-up the CPU Core Speed
-| in the Core Speed Look-up Table.
-|
-| Parameters: R3 = Address of Bus Speed
-| R4 = Address of Core Speed
-| R5 = Number of 13.5 Mhz clock ticks found in time loop.
-| R6 = Pointer to Core-Speed Look-Up Table
-|
-| Returns: (R3) = >0: Bus Speed.
-| 0: Bus Speed not found in Look-Up Table.
-| (R4) = >0: Core Speed.
-| 0: Core Speed not found in Look-Up Table.
-|
-| Note: Core Speed = Bus Speed * Mult Factor (1-4x).
-|
-******************************************************************************/
-gcs_cspd_lookup:
-
- li r9,1 /* r9 <- core speed mult */
- /*--------------------------------------------------------------------+
- | Get theoritical number 13.5 Mhz ticks for a given Bus Speed from
- | Look-up Table. Check all mult factors to determine if calculated
- | value matches theoretical value (within a tolerance).
- +--------------------------------------------------------------------*/
-gcs_cspd_loop:
- lwz r10,0(r6) /* r10 <- no. ticks from LUT*/
- divw r10,r10,r9 /* r10 <- div mult (1-4x) */
- subi r11,r10,GCS_CTICK_TOL /* r11 <- no. tks low range */
- addi r12,r10,GCS_CTICK_TOL /* r12 <- no. tks high range*/
-
- cmpw cr0,r5,r11 /* calc value within range? */
- blt gcs_cspd_retry /* less than low range */
- cmpw cr0,r5,r12
- bgt gcs_cspd_retry /* greater than high range */
- b gcs_cspd_fnd /* calc value within range */
-
- /*--------------------------------------------------------------------+
- | SO FAR CORE SPEED NOT FOUND: Check next mult factor
- +--------------------------------------------------------------------*/
-gcs_cspd_retry:
- addi r9,r9,1 /* bump mult factor (1-4x) */
- cmpwi cr0,r9,GCS_NMULT
- ble gcs_cspd_loop
-
- /*--------------------------------------------------------------------+
- | SO FAR CORE SPEED NOT FOUND: Point at next Bus Speed in LUT
- +--------------------------------------------------------------------*/
- li r9,1 /* reset mult factor */
- addi r6,r6,GCS_TROW_BYTES /* point at next table entry*/
- lwz r10,0(r6)
- cmpwi cr0,r10,0 /* check for EOT flag */
- bne gcs_cspd_loop
-
- /*--------------------------------------------------------------------+
- | COMPUTE CORE SPEED AND GET BUS SPEED FROM LOOK-UP TABLE
- +--------------------------------------------------------------------*/
-gcs_cspd_fnd:
- lwz r5,4(r6) /* r5 <- Bus Speed in LUT */
- mullw r6,r5,r9 /* r6 <- Core speed */
- stw r5,0(r3) /* (r3) <- Bus Speed */
- stw r6,0(r4) /* (r4) <- Core Speed */
-
- blr
-#endif